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公开(公告)号：US20070085536A1
公开(公告)日：2007-04-19
申请号：US11540164
申请日：2006-09-29
IPC分类号： G01V3/00
CPC分类号： G01R33/565 , G01R33/3415 , G01R33/5659
摘要： In the operation of a magnetic resonance system, an RF excitation coil emits an excitation pulse such that nuclei in an examination subject are excited to emit of magnetic resonance signals. A number of local coils acquire the magnetic resonance signals emitted from the examination subject, with the magnetic resonance signals acquired by the local coils being coded in frequency space. An evaluation device accepts the magnetic resonance signals acquired by the local coils or accepts intermediate signals derived therefrom via one transmission channel per signal, and corrects the accepted signals using correction signals. The evaluation device uses the corrected signals reconstructing an image of the examination subject. The evaluation device determines the correction signals for all signals to be corrected using the same reference signal.
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2.发明授权Method for MRT imaging on the basis of conventional PPA reconstruction methods 有权基于常规PPA重建方法的MRT成像方法公开(公告)号：US07495437B2
公开(公告)日：2009-02-24
申请号：US11409373
申请日：2006-04-21
IPC分类号： G01V3/00
CPC分类号： G01R33/5611
摘要： In a method and apparatus for generating a magnetic resonance image of a contiguous region of a human body on the basis of partial parallel acquisition (PPA) by excitation of nuclear spins and measurement of radio-frequency signals indicating the excited spins, the spin excitation is implemented in steps with measurement of an RF response signal simultaneously in each of a number of N component coils. A number of response signals thus are acquired that, for each component coil, form an incomplete data set (40) of acquired RF signals. Additional acquired calibration data points exist for each incomplete data set. The N incomplete data sets are acquired to a subset of M reduced, incomplete data sets on the basis of an N×M reduction matrix, so that M reduced, incomplete data sets are obtained, M complete data sets are formed on the basis of an N×M reconstruction matrix with the non-measured lines of the M reduced, incomplete data sets being reconstructed from all N incomplete data sets. A spatial transformation of the completed reduced data sets is then implemented in order to form a complete image data set from each completed, reduced data set.
摘要翻译： 在通过激励核自旋的部分并行采集（PPA）和表示激发的自旋的射频信号的测量来产生人体的连续区域的磁共振图像的方法和装置中，自旋激发是 在多个N个分量线圈的每一个中同时测量RF响应信号的步骤实现。 因此，获得多个响应信号，对于每个分量线圈，形成所获取的RF信号的不完整数据集（40）。 对于每个不完整的数据集，存在额外的获取的校准数据点。 N个不完整的数据集基于N×M个缩减矩阵被获取到M个不完整的数据集的子集，从而获得M个减少的不完整的数据集，M个完整数据集是基于N×M重建形成的 矩阵，其中M个未测量的线减少，不完整的数据集从所有N个不完整的数据集重建。 然后实现完成的缩减数据集的空间变换，以便从每个完成的简化数据集合形成完整的图像数据集。
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3.发明申请Method for MRT imaging on the basis of conventional PPA reconstruction methods 有权基于常规PPA重建方法的MRT成像方法公开(公告)号：US20060284812A1
公开(公告)日：2006-12-21
申请号：US11409373
申请日：2006-04-21
IPC分类号： G09G3/36
CPC分类号： G01R33/5611
摘要： In a method and apparatus for generating a magnetic resonance image of a contiguous region of a human body on the basis of partial parallel acquisition (PPA) by excitation of nuclear spins and measurement of radio-frequency signals indicating the excited spins, the spin excitation is implemented in steps with measurement of an RF response signal simultaneously in each of a number of N component coils. a number of response signals thus are acquired that, for each component coil, form an incomplete data set (40) of acquired RF signals. Additional acquired calibration data points exist for each incomplete data set. The N incomplete data sets are acquired to a subset of M reduced, incomplete data sets on the basis of an N×M reduction matrix, so that M reduced, incomplete data sets are obtained, M complete data sets are formed on the basis of an N×M reconstruction matrix with the non-measured lines of the M reduced, incomplete data sets being reconstructed from all N incomplete data sets. A spatial transformation of the completed reduced data sets is then implemented in order to form a complete image data set from each completed, reduced data set.
摘要翻译： 在通过激励核自旋的部分并行采集（PPA）和表示激发的自旋的射频信号的测量来产生人体的连续区域的磁共振图像的方法和装置中，自旋激发是 在多个N个分量线圈的每一个中同时测量RF响应信号的步骤实现。 因此，对于每个分量线圈，获得多个响应信号，形成所获取的RF信号的不完整数据集（40）。 对于每个不完整的数据集，存在额外的获取的校准数据点。 N个不完整的数据集基于N×M个缩减矩阵被获取到M个不完整的数据集的子集，从而获得M个减少的不完整的数据集，M个完整数据集是基于N×M重建形成的 矩阵，其中M个未测量的线减少，不完整的数据集从所有N个不完整的数据集重建。 然后实现完成的缩减数据集的空间变换，以便从每个完成的简化数据集合形成完整的图像数据集。
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公开(公告)号：US07295008B2
公开(公告)日：2007-11-13
申请号：US11540164
申请日：2006-09-29
IPC分类号： G01V3/00
CPC分类号： G01R33/565 , G01R33/3415 , G01R33/5659
摘要： In the operation of a magnetic resonance system, an RF excitation coil emits an excitation pulse such that nuclei in an examination subject are excited to emit of magnetic resonance signals. A number of local coils acquire the magnetic resonance signals emitted from the examination subject, with the magnetic resonance signals acquired by the local coils being coded in frequency space. An evaluation device accepts the magnetic resonance signals acquired by the local coils or accepts intermediate signals derived therefrom via one transmission channel per signal, and corrects the accepted signals using correction signals. The evaluation device uses the corrected signals reconstructing an image of the examination subject. The evaluation device determines the correction signals for all signals to be corrected using the same reference signal.
摘要翻译： 在磁共振系统的操作中，RF激励线圈发射激励脉冲，使得激励检查对象中的核发出磁共振信号。 多个本地线圈获取从检查对象发射的磁共振信号，由本地线圈获取的磁共振信号在频率空间中编码。 评估装置接受本地线圈获取的磁共振信号，或者通过每个信号经由一个传输信道接收从其导出的中间信号，并使用校正信号来校正接受的信号。 评估装置使用重建检查对象的图像的校正信号。 评估装置使用相同的参考信号确定要校正的所有信号的校正信号。
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5.发明授权Fat and iron quantification using a multi-step adaptive fitting approach with multi-echo magnetic resonance imaging 有权脂肪和铁定量使用多步自适应拟合方法与多回波磁共振成像公开(公告)号：US09194925B2
公开(公告)日：2015-11-24
申请号：US14054903
申请日：2013-10-16
CPC分类号： G01R33/4828 , G01R33/50
摘要： A computer-implemented method for quantifying fat and iron in anatomical tissue includes acquiring a plurality of multi-echo signal datasets representative of the anatomical tissue using a magnetic resonance (MR) pulse sequence. A plurality of multi-echo signal datasets are selected from the plurality of multi-echo signal datasets and used to determine a first water magnitude value and a first fat magnitude value. In response to determining that the multi-echo signal datasets include at least three multi-echo datasets, a first stage analysis is performed. This first stage analysis comprises selecting a first effective transverse relaxation rate value. Next, first algorithm inputs comprising the first water magnitude value, the first fat magnitude value, and the first effective transverse relation rate value are created. Then, a non-linear fitting algorithm is performed based on the first algorithm inputs to calculate a second water magnitude value, a second fat magnitude value, and a second effective transverse relaxation rate value. A first proton density fat fraction value is then determined based on the second water magnitude value and the second fat magnitude value.
摘要翻译： 用于在解剖组织中量化脂肪和铁的计算机实现的方法包括使用磁共振（MR）脉冲序列获取代表解剖组织的多个多回波信号数据集。 从多个多回波信号数据集中选择多个多回波信号数据集，并用于确定第一水量值和第一脂肪量值。 响应于确定多回波信号数据集包括至少三个多回波数据集，执行第一阶段分析。 该第一阶段分析包括选择第一有效横向松弛率值。 接下来，创建包括第一水量值，第一脂肪量值和第一有效横向关系速率值的第一算法输入。 然后，基于第一算法输入来执行非线性拟合算法，以计算第二水量值，第二脂肪量值和第二有效横向松弛率值。 然后基于第二水量值和第二脂肪量值来确定第一质子密度脂肪分数值。
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6.发明申请公开(公告)号：US20140161336A1
公开(公告)日：2014-06-12
申请号：US14088386
申请日：2013-11-23
CPC分类号： G01R33/5608 , G01R33/3415 , G01R33/5611
摘要： An apparatus and a method for generating an image from N reception signal data sets of signals received by a plurality of coils of a magnetic resonance tomography appliance from a region of a body to be examined using an image processing computer are provided. The apparatus includes a degree-of-compression determining device. A ratio N/M of the number N of N reception signal data sets generated from the signals received by the plurality of coils to a smaller number M of mode data sets is defined taking account of a plurality of parameters. The plurality of parameters at least also represent system resources of the image processing computer. Using a compression computer, the N reception signal data sets are compressed into M mode data sets. After this, the M mode data sets are used by the image processing computer for generating the image of the region of the body.
摘要翻译： 提供了一种用于从使用图像处理计算机的被检体的区域从磁共振断层摄影装置的多个线圈接收的N个接收信号数据组生成图像的装置和方法。 该装置包括压缩度确定装置。 通过考虑多个参数来定义从多个线圈接收到的信号产生的N个接收信号数据集合的数目N的比N / M到模式数据集的较小数量M. 多个参数至少也表示图像处理计算机的系统资源。 使用压缩计算机，N个接收信号数据集被压缩成M个模式数据集。 之后，M模式数据集由图像处理计算机用于生成身体区域的图像。
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7.发明授权Magnetic resonance method and apparatus for time-resolved acquisition of magnetic resonance data 有权用于时间分辨采集磁共振数据的磁共振方法和装置公开(公告)号：US08598873B2
公开(公告)日：2013-12-03
申请号：US12700191
申请日：2010-02-04
IPC分类号： A61B5/055 , G01R33/563 , G01R33/561
CPC分类号： G01R33/56375 , A61B5/0555 , G01R33/5619 , G01R33/56308 , G01R33/56383
摘要： In a method and apparatus for time-resolved acquisition of magnetic resonance (MR) data, an examination subject is continuously moved through the examination region of an MR scanner, and MR signals are acquired. Prior to the acquisition of MR signals, a phase coding that corresponds to a position for data entry in k-space is carried out. An interruption of the movement of the subject takes place at a predetermined table position, and the acquisition of MR signals is continued over the course of a predetermined time period, while the subject is at rest in the predetermined position. At least while the subject is at rest, the phase coding causes acquisition of a predetermined number of MR signals for filling a first region of k-space to alternate with MR data and a predetermined number of MR signals for filling a second region of k-space.
摘要翻译： 在用于时间分辨获取磁共振（MR）数据的方法和装置中，检查对象连续移动通过MR扫描器的检查区域，并且获取MR信号。 在获取MR信号之前，执行对应于k空间中的数据输入位置的相位编码。 被检体的动作的中断发生在规定的工作台位置，并且在预定时间段内持续进行MR信号的采集，同时被检体在预定位置处于静止状态。 至少在被摄体处于静止状态时，相位编码使得获得预定数量的MR信号用于填充k空间的第一区域以与MR数据交替并且预定数量的MR信号用于填充k-空间的第二区域， 空间。
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8.发明授权公开(公告)号：US08362771B2
公开(公告)日：2013-01-29
申请号：US12687958
申请日：2010-01-15
IPC分类号： G01V3/00
CPC分类号： G01R33/3875 , G01R33/243 , G01R33/4835 , G01R33/5617 , G01R33/56375 , G01R33/56383
摘要： A fast, efficient, qualitatively high-grade shim is enabled in a magnetic resonance apparatus having a displaceable patient bed and an examination region of the patient that is to be examined is larger than an imaging region of the magnetic resonance apparatus. Field inhomogeneities are measured while the examination region is moved through the imaging region by a continuous displacement of the patient bed with the patient positioned thereon. Information representing field inhomogeneities is acquired at multiple positions of the patient bed from respective magnetic resonance signals received at these positions, by excitation of multiple respective slices before the readout of the echo of the first of these slices, with one echo train composed of multiple echoes being generated per excitation signal. Shim parameters of the magnetic resonance apparatus are adjusted dependent on the measured information.
摘要翻译： 在具有可位移的患者床的磁共振装置中能够实现快速，高效，定性高档的垫片，并且待检查的患者的检查区域大于磁共振装置的成像区域。 当检测区域通过患者定位在其上的患者床的连续移位而移动通过成像区域时，测量场不均匀性。 通过在读出这些切片中的第一个的回波之前激励多个相应的切片，在由多个回波组成的一个回波串的情况下，通过在多个相应切片的激发，从患者床的多个位置获取表示场不均匀性的信息， 每个激励信号产生。 根据测量信息调整磁共振设备的Shim参数。
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9.发明申请Method and apparatus for improved transmission-side accelerated PPA-based volume-selective magnetic resonance imaging 有权用于改进传输侧加速PPA体积选择性磁共振成像的方法和装置公开(公告)号：US20070013374A1
公开(公告)日：2007-01-18
申请号：US11408552
申请日：2006-04-21
CPC分类号： G01R33/5611 , G01R33/5612 , G01R33/583
摘要： In a method for determining transmission coil-specific RF excitation pulses for component coils of a transmission coil array for accelerated, PPA-based volume-selective magnetic resonance excitation of a tissue region of a patient, and a magnetic resonance tomography apparatus operating according to the method, a first series of volume-selective RF excitation pulses along a first transmission trajectory in transmission κ-space is successively individually radiated by the component coils of the transmission coil array and the resulting magnetic resonance signals are received, and a second series of volume-selected RF excitation pulses along a further reduced transmission trajectory in transmission κ-space is simultaneously radiated by all component coils of the transmission coil array and the resulting magnetic resonance signals are received, and a complete transmission trajectory in transmission K-space is then determined from which combination coefficients are calculated, and the coil specific RF excitation pulses are then calculated from the combination coefficients in order to produce a desired excitation profile.
摘要翻译： 在用于确定用于加速的基于PPA的体积选择性磁共振激励患者的组织区域的传输线圈阵列的分量线圈的传输线圈特定RF激励脉冲的方法中，以及根据该方法操作的磁共振断层摄影装置 方法中，沿传输线圈阵列中的第一传输轨迹的第一系列体积选择性RF激励脉冲被传输线圈阵列的分量线圈连续单独辐射，并且接收所得到的磁共振信号，并且接收第二系列体积 通过传输线圈阵列的所有分量线圈同时辐射沿着传输卡巴空间中进一步减小的传输轨迹的选择的RF激励脉冲，并且接收所得到的磁共振信号，然后确定传输K空间中的完整传输轨迹 从中计算组合系数， 然后从组合系数计算线圈特定的RF激励脉冲，以便产生期望的激励分布。
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10.发明申请Method and MR apparatus for PPA MR imaging with radial data acquisition 有权用于具有径向数据采集的PPA MR成像的方法和MR装置公开(公告)号：US20050251023A1
公开(公告)日：2005-11-10
申请号：US11119478
申请日：2005-04-29
IPC分类号： A61B6/00 , G01N23/00 , G01R33/561 , G21K1/12
CPC分类号： G01R33/5611
摘要： In a method and for MR apparatus PPA imaging with radial data acquisition in magnetic resonance tomography, k-space is under-scanned by acquiring a number of projections φ with a coil array of M component coils, a shift operator C(±nΔk) is determined for a projection φi on the basis of measured magnetizations along a projection φi±α0 that encompasses with φi an angle α0, with n=1, 2, . . . , M−1, the shift operator C(±nΔk) is applied to individual points of projection φi in order to obtain calculated projection points, the determination and the application of the shift operator C(±nΔk) are repeated for all projections φ, and an image is reconstructed in the spatial domain on the basis of the projections, which have been completed purely computationally.
摘要翻译： 在磁共振断层成像中利用径向数据采集的方法和MR装置PPA成像中，通过用M个分量线圈的线圈阵列获取多个投影phi，使k空间被扫描，移位算子C（±nDeltak）为 基于沿着具有角度α0，其中n = 1,2，...包围的投影phi±α0的测量磁化来确定投影phii。 。 。 ，M-1，将移位算子C（±nDeltak）应用于投影phii的各个点，以获得计算的投影点，对于所有投影phi重复移位算子C（±nDeltak）的确定和应用， 并且基于已经完全在计算上完成的投影，在空间域中重建图像。
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